Abstract: A massage unit designed to produce percussive directional stroking for medical purposes such as: to loosen and to mobilize, in a selected direction, bronchial secretions or other congestive material in humans or animals; to improve blood circulation, and; to relax muscles, has a portable housing that houses a motor which transmits rotary power through a swivel coupling assembly attached to the housing through a drive cable to an eccentric weight housed within a palm-sized applicator head having a resilient applicator pad to be applied to the chest, back, arms, legs or other parts of a patient's body. The eccentric weight rotates freely within the head to cause the applicator pad to transmit a percussive directional stroking force to the body. The resultant force transmitted to the body has two components: one perpendicular to the body to loosen congestive material, and one force component parallel to the body to mobilize loosened congestive material in a selected direction.